Working for the World Bank got Susan interested in health and economics. Dr. Horton then proceeded to work at the International Centre for Diarrheal Disease Research in Bangladesh while writing her thesis. She has worked or taught in approximately 25 low and middle-income countries, on topics ranging from labour markets, women’s participation, benefits and costs of micronutrient interventions, and currently costs and benefits of breastfeeding, cost and cost-effectiveness of cancer interventions, and disease control priorities in low and middle–income countries. Currently, Dr.Horton is working on the Disease Control Priorities project and in the past, worked on research projects with the World Bank, FAO, WHO, UNICEF, Copenhagen Consensus, and others.